Materials Today: Proceedings 2 (2015) 5578 – 5581 Available online at www.sciencedirect.com ScienceDirect 2214-7853 © 2015 Elsevier Ltd. All rights reserved. Selection and Peer-review under responsibility of the Committee Members of International Conference on Solid State Physics 2013 (ICSSP’13) doi:10.1016/j.matpr.2015.11.089 International Conference on Solid State Physics 2013 (ICSSP’13) Phase stablization and frequency dependent dielectric response of La-doped Sr-hexaferrites Muhammad Azim, Shahid Atiq*, Saira Riaz and Shahzad Naseem Centre of Excellence in Solid State Physics, University of the Punjab, Quaid-e-Azam campus, Lahore-54590, Pakistan Abstract A series of Sr 1-x La x Fe 12 O 19 (x = 0, 0.1, 0.15 and 0.2) ferrites have been synthesized using a novel sol-gel based auto- combustion route. The phase stabilization of pure hexagonal SrFe 12 O 19 was exhibited by X-ray diffraction. The diffraction data was utilized to index the intensity peaks, following the methodology described by Cullity. The structural parameters such as lattice constant, unit cell volume, crystallite size, X-ray density and porosity of the samples were also evaluated from the data. All these parameters were observed to be influenced by the increase in La contents at Sr-sites. Dielectric constant was found to decrease with the increase in frequency and doping of lanthanum in SrFe 12 O 19 , attributed to the relaxation process. © 2015 Elsevier Ltd. All rights reserved. Selection and Peer-review under responsibility of the Committee Members of International Conference on Solid State Physics 2013 (ICSSP’13). Keywords: M-type hexaferrites; dielectric response * Corresponding author. Tel.: +92-423-5839387; fax: +92-429-9231139. E-mail address: satiq.cssp@pu.edu.pk © 2015 Elsevier Ltd. All rights reserved. Selection and Peer-review under responsibility of the Committee Members of International Conference on Solid State Physics 2013 (ICSSP’13)